CN220474851U - Negative electrode current collecting disc assembly and cylindrical battery - Google Patents

Abstract

The utility model provides a negative electrode current collecting disc assembly and a cylindrical battery, which comprise a negative electrode column, a negative electrode current collecting disc and a first insulating piece, wherein the negative electrode column is fixedly arranged on the first insulating piece, one end of the negative electrode column is connected with the negative electrode current collecting disc arranged below the first insulating piece, the other end of the negative electrode column is used for being connected with the negative electrode end of a battery shell, a plurality of through holes are formed in the surface of the first insulating piece at equal intervals around the central axis of the negative electrode column, and the through holes are positioned on the periphery side of the negative electrode column and are used for welding the negative electrode current collecting disc and the negative electrode end of a winding core through the through holes. According to the utility model, the negative pole is directly connected with the winding core through the negative pole current collecting disc, so that the use of a connecting sheet is omitted, the connection distance between the negative pole and the winding core is shortened, the whole negative pole current collecting disc assembly occupies less space in the axial direction of the battery shell, and therefore, the space utilization rate of the winding core in the battery can be improved, and the energy density of the battery is improved.

Description

Negative electrode current collecting disc assembly and cylindrical battery

Technical Field

The utility model relates to the technical field of cylindrical batteries, in particular to a negative electrode current collecting disc assembly and a cylindrical battery.

Background

The full-tab cylindrical lithium ion battery is an important development direction of the current power battery, and the traditional cylindrical battery is generally composed of a shell, a positive electrode cover plate assembly, a negative electrode cover plate assembly and a winding core.

At present, most of cylindrical battery shells are provided with openings at two ends, and the positive electrode cover plate assembly and the negative electrode cover plate assembly are respectively arranged at two ends of the shell and are respectively welded with lugs arranged at two ends of a winding core in the shell. The utility model discloses a battery cover plate assembly and cylinder battery of publication No. CN218548597U, it is through the connection piece that draws forth on the negative pole current collecting plate with the utmost point post on the apron weld, form negative pole cover plate assembly from this, weld the negative pole current collecting plate with the negative pole ear of rolling up the flat on the core again, insert the core into the casing at last, bend the connection piece, make the connection piece after bending hold in the casing, weld apron and casing opening part at last.

Above-mentioned cylinder battery assembly methods has increased the connection piece on owing to negative pole apron subassembly, has increased the battery internal resistance on the one hand, and on the other hand, the connection piece needs to carry out the zigzag and bends, and this can occupy great space at the inside axial direction of battery, reduces the core in the inside space utilization of battery to reduce the energy density of battery.

Disclosure of Invention

In view of this, the utility model provides a negative electrode current collecting disc assembly and a cylindrical battery, which solve the problem that the current negative electrode current collecting disc needs to be bent to cause that the negative electrode current collecting disc assembly occupies a larger space in the axial direction inside the battery and the energy density of the battery is reduced.

The technical scheme of the utility model is realized as follows:

in one aspect, the utility model provides a negative electrode current collecting disc assembly, which comprises a negative electrode column, a negative electrode current collecting disc and a first insulating part, wherein the negative electrode column is fixedly arranged on the first insulating part, one end of the negative electrode column is connected with the negative electrode current collecting disc arranged below the first insulating part, the other end of the negative electrode column is used for being connected with a negative electrode end of a battery shell, a plurality of through holes are formed in the surface of the first insulating part at equal intervals around the central axis of the negative electrode column, and the through holes are positioned on the periphery side of the negative electrode column and are used for welding the negative electrode current collecting disc and the negative electrode end of a winding core through the through holes.

In the above technical solution, preferably, the plurality of through holes are arranged in a stripe shape around the negative electrode post in the radial direction.

Further, preferably, a welding groove corresponding to the through hole is provided on a surface of the negative electrode current collecting disc facing the first insulating member.

On the other hand, the utility model also discloses a cylindrical battery, which comprises a shell, a winding core, a positive electrode cover plate component and a negative electrode current collecting disk component, wherein the shell is provided with an open end and a closed end which are oppositely arranged, the closed end is provided with a mounting hole, the diameter of the mounting hole is smaller than the diameter of an inner cavity of the shell, the winding core and the negative electrode current collecting disk component are arranged in the shell, the negative electrode end of the winding core is welded with the negative electrode current collecting disk, a negative electrode column penetrates through the mounting hole and is connected with the shell, and the positive electrode cover plate component is fixedly arranged at the open end and is electrically connected with the positive electrode end of the winding core.

On the basis of the above technical scheme, preferably, the negative electrode current collecting disc assembly further comprises a substrate, the substrate is arranged on one surface, far away from the negative electrode current collecting disc, of the first insulating piece, the negative electrode column is fixedly arranged on the substrate and is electrically isolated from the substrate, the negative electrode column penetrates through the first insulating piece and is connected with the negative electrode current collecting disc, the diameter of the substrate is smaller than that of the first insulating piece, the substrate is used for being connected with a mounting hole on the negative electrode end of the battery shell, and a plurality of penetrating holes are formed in the periphery side of the substrate.

Further, preferably, the negative electrode current collecting disc assembly further comprises a second insulating member, a sealing member and a riveting member, wherein the negative electrode column, the second insulating member, the substrate and the first insulating member are fixedly connected sequentially through the riveting member, the sealing member is arranged between the riveting member and the substrate, and the riveting member is connected with the negative electrode current collecting disc.

Further, preferably, a positioning portion is provided on the outer peripheral side of the end of the base plate connected to the first insulating member, a positioning groove coaxial with the mounting hole is provided on the inner wall of the closed end, and the positioning portion is connected to the positioning groove.

Further, preferably, an outer edge of one side of the first insulating member away from the substrate is provided with an annular flange, and an inner diameter of the annular flange is larger than a diameter of the anode current collecting disc and a diameter of the winding core.

Preferably, the closed end of the shell is provided with an explosion-proof valve, and the surface of the first insulating piece is provided with a pressure relief hole.

Compared with the prior art, the utility model has the following beneficial effects:

(1) According to the negative electrode current collecting disc assembly disclosed by the utility model, one end of the negative electrode column is connected with the negative electrode current collecting disc arranged below the first insulating part, and a plurality of through holes are formed in the surface of the first insulating part on the peripheral side of the negative electrode column at equal intervals, so that the welding of the negative electrode current collecting disc and the negative end of the winding core can be completed through the through holes, the negative electrode column is directly connected with the winding core through the negative electrode current collecting disc, the use of connecting sheets is omitted, the connection distance between the negative electrode column and the winding core is shortened, the space occupied by the whole negative electrode current collecting disc assembly in the axial direction of the battery shell is less, and therefore, the space utilization rate of the winding core in the battery can be improved, and the energy density of the battery is improved; (2) The welding groove corresponding to the through hole is formed in one surface of the negative electrode current collecting disc, facing the first insulating piece, so that on one hand, the welding area between the negative electrode current collecting disc and the lug on the winding core can be determined through the welding groove, and on the other hand, the welding groove can prevent welding slag from entering the winding core to cause short circuit;

(3) Through setting up the base plate in the one side that the negative pole current collecting plate was kept away from to first insulating part, make negative pole post setting on the base plate to with base plate electric isolation, make the diameter of base plate be less than the diameter of first insulating part simultaneously, after negative pole current collecting plate subassembly and roll up the core and connect, both wholly go into the shell after, can pass the mounting hole on the battery housing negative pole end with the base plate, and make base plate and battery housing weld, thereby realize electric isolation between negative pole post and the battery housing, guarantee that the battery housing is uncharged, improve cylindrical battery security.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic perspective view of a negative current collecting plate assembly according to the present disclosure;

FIG. 2 is an exploded schematic view of the disclosed anode current collecting plate assembly;

FIG. 3 is a top view of a negative current collecting plate assembly of the present disclosure;

FIG. 4 is a plan cross-sectional view taken at A-A of FIG. 3;

fig. 5 is a schematic perspective view of a cylindrical battery according to the present disclosure;

FIG. 6 is an exploded view of a cylindrical battery of the present disclosure;

FIG. 7 is an enlarged view of a portion of FIG. 6 at B;

reference numerals:

1. a negative current collecting plate assembly; 11. a substrate; 12. a negative electrode column; 13. a negative electrode current collecting plate; 14. a first insulating member; 141. a through hole; 131. welding grooves; 2. a housing; 3. a winding core; 4. a positive electrode cover plate assembly; 21. a mounting hole; 111. a positioning part; 22. a positioning groove; 15. a second insulating member; 16. a seal; 17. a rivet; 142. an annular flange; 23. an explosion-proof valve; 143. and the pressure relief hole.

Detailed Description

The following description of the embodiments of the present utility model will clearly and fully describe the technical aspects of the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the present utility model.

As to the prior art, the connection between the negative electrode post 12 and the negative electrode current collecting disc 13 is usually required by means of a connection sheet, during the assembly process of the negative electrode cover plate assembly, the connection sheet on the negative electrode current collecting disc 13 and the negative electrode post 12 are welded first, then the negative electrode current collecting disc 13 is welded with the full tab at the end of the winding core 3 first, and then the connection sheet is required to be folded during the process of winding the winding core 3 into the shell, so that the connection sheet is bent in a zigzag manner, which occupies a larger space in the axial direction inside the battery, and reduces the space utilization rate of the winding core 3 inside the battery, thereby reducing the energy density of the battery.

For this reason, the embodiment of the present utility model discloses a negative current collecting plate assembly to solve the above technical problems, as shown in fig. 1, and in combination with fig. 2 and 3, the negative current collecting plate assembly includes a negative column 12, a negative current collecting plate 13, and a first insulating member 14.

The negative electrode column 12 is fixedly disposed on the first insulating member 14, one end of the negative electrode column 12 is connected with the negative electrode current collecting plate 13 disposed below the first insulating member 14, and the other end is used for being connected with a negative electrode end of the battery case. It will be appreciated that the diameter of the anode stem of this embodiment is smaller than the diameter of the first insulating member 14, and in some embodiments, the anode stem 12 may pass through the first insulating member 14 and be fixedly connected to the first insulating member 14.

When the negative electrode current collecting disc assembly of the embodiment is connected with the negative electrode end of the winding core, the following scheme is adopted: a plurality of through holes 141 are provided on the surface of the first insulator 14 at equal intervals around the central axis of the anode stem, and the through holes 141 are located on the outer peripheral side of the anode stem 12, so that the anode current collecting plate 13 and the anode end of the winding core are welded through the through holes 141.

By adopting the technical scheme, the assembled negative electrode current collecting disc assembly is placed at the negative end of the winding core 3, the welding of the negative electrode current collecting disc 13 and the negative end of the winding core 3 can be completed through the through hole 141, the negative electrode column 12 is directly connected with the winding core 3 through the negative electrode current collecting disc 13, the use of connecting sheets is omitted, the connecting distance between the negative electrode column 12 and the winding core 3 is shortened, the negative electrode current collecting disc assembly and the winding core 3 are integrally put into the shell, the negative electrode column 12 is abutted with the inner bottom surface of the shell, the negative electrode column and the shell 2 can be connected through penetration welding, and under the structural arrangement, the occupied space of the whole negative electrode current collecting disc assembly in the axial direction of the battery shell 2 is less, so that the space utilization rate of the winding core 3 in the battery can be improved, and the energy density of the battery is improved.

It should be noted that in the above embodiment, when the negative electrode column is connected to the casing, the casing is open at one end, that is, the negative electrode end of the casing is a closed end, and after the negative electrode current collecting disc assembly and the winding core 3 are integrally inserted into the casing, the negative electrode column 12 contacts with the inner bottom surface of the casing, and the connection between the negative electrode column 12 and the casing can be achieved through penetration welding.

In order to make the welding area between the anode current collecting plate 13 and the tab on the winding core 3 larger, the present embodiment provides a plurality of through holes 141 in a stripe shape around the radial direction of the anode stem 12. The negative electrode current collecting disc 13 can be welded from the outer side of the winding core 3 to the middle part, so that the winding core 3 can be welded with the negative electrode current collecting disc 13 from inside to outside.

As some preferred embodiments, the side of the anode current collecting plate 13 facing the first insulator 14 is provided with a welding groove 131 corresponding to the position of the through hole 141. The arrangement is thereby such that, on the one hand, the welding area of the anode collector disk 13 with the tab on the winding core 3 can be determined by the welding groove 131, and, on the other hand, the welding groove 131 can block the penetration of welding slag into the winding core 3, resulting in a short circuit.

The utility model also discloses a cylindrical battery, referring to fig. 5-7, the cylindrical battery comprises a shell 2, a winding core 3, a positive electrode cover plate component 4 and the negative electrode current collecting disc component 1, wherein the shell 2 is provided with an open end and a closed end which are oppositely arranged, the closed end is provided with a mounting hole 21, the diameter of the mounting hole 21 is smaller than that of the inner wall of the shell 2, the winding core 3 and the negative electrode current collecting disc component 1 are arranged in the shell 2, the negative electrode end of the winding core 3 is welded with the negative electrode current collecting disc 13, a negative electrode column passes through the mounting hole 21 and is welded with the shell 2, and the positive electrode cover plate component 4 is fixedly arranged with the open end and is electrically connected with the positive electrode end of the winding core 3.

By adopting the technical scheme, after the welding of the cathode current collecting disc 13 and the lug of the cathode end of the winding core 3 is completed, the winding core 3 and the whole cathode current collecting disc assembly 1 are plugged into the shell 2, the cathode column 12 passes through the mounting hole 21 on the shell 2, the connection between the cathode column 12 and the shell 2 is realized, after the assembly of the cathode current collecting disc assembly 1 and the shell 2 is completed, the anode cover plate assembly 4 is welded with the anode end of the winding core 3, and then the anode cover plate assembly 4 is welded with the anode opening end of the shell 2.

Because the whole negative electrode current collecting disc assembly 1 occupies less space in the axial direction of the battery shell 2, the space utilization rate of the winding core 3 in the battery can be improved, and the energy density of the cylindrical battery can be improved.

In addition, it is worth noting that the negative electrode terminal of the battery case 2 is only provided with a mounting hole, and meanwhile, the negative electrode column on the negative electrode current collecting disc component penetrates through the mounting hole to be connected with the case, and compared with a traditional case structure with two open ends, a top cover is not required to be arranged, so that space occupation is further reduced in the axial direction of the case, and energy density is improved.

Because negative pole post 12 is connected with the battery casing, and the battery casing is negatively charged, has the potential safety hazard, and for this reason, this embodiment is in order to solve above-mentioned technical problem, and the scheme that adopts is: the negative electrode current collecting disc assembly 1 further comprises a substrate 11, the substrate 11 is arranged on one surface of the first insulating part 14, which is far away from the negative electrode current collecting disc 13, the substrate 11 is made of metal, the negative electrode column 12 is fixedly arranged on the substrate 11 and is electrically isolated from the substrate 11, the negative electrode column 12 penetrates through the first insulating part 14 and is connected with the negative electrode current collecting disc 13, the diameter of the substrate 11 is smaller than that of the first insulating part 14, the substrate 11 is used for being connected with a mounting hole on the negative electrode end of the battery shell, and the through holes 141 are located on the outer peripheral side of the substrate 11.

By adopting the technical scheme, after the welding of the negative electrode current collecting disc assembly 1 and the winding core is completed, the substrate 11 can pass through the mounting hole 21 after the whole winding core is put into the shell, so that the substrate 11 and the battery shell are subjected to laser welding at the matching position of the mounting hole 21, at the moment, the negative electrode column 12 and the substrate 11 are electrically isolated, the negative electrode column 12 and the battery shell 2 are not electrically connected, the battery shell is not electrified, and the safety of the cylindrical battery is ensured.

Preferably, referring to fig. 4, the anode current collecting disc assembly further includes a second insulating member 15, a sealing member 16, and a rivet 17, and the anode post 12, the second insulating member 15, the substrate 11, and the first insulating member 14 are fixedly connected in sequence by the rivet 17, and the sealing member 16 is disposed between the rivet 17 and the substrate 11. By adopting the technical scheme, the riveting process can be utilized to rivet the cathode column 12, the second insulating piece 15, the substrate 11 and the first insulating piece 14 through the riveting piece 17, so that the partial assembly of the cathode current collecting disc assembly is realized, the cathode current collecting disc 13 is finally placed on the bottom surface of the first insulating piece 14, and the riveting piece 17 and the cathode current collecting disc 13 are welded through penetration welding.

By providing the sealing member 16 between the caulking member 17 and the substrate 11, the sealability of the anode current collecting disk assembly can be improved, and leakage of the electrolyte can be avoided.

As some preferred embodiments, a positioning portion 111 is provided on the outer peripheral side of the end of the base plate 11 connected to the first insulating member 14, and a positioning groove 22 coaxial with the mounting hole 21 is provided on the inner wall of the closed end, and the positioning portion 111 is connected to the positioning groove 22. Therefore, after the cathode current collecting disc assembly 1 is put into the shell, the substrate 11 can be matched and connected by the positioning part 111 and the positioning groove 22 after passing through the mounting hole 21, so that the position of the substrate 11 on the shell 2 is limited, the connection between the substrate 11 and the shell 2 is realized, and meanwhile, the electrolyte leakage path can be prolonged and the tightness is improved due to the matching of the positioning part 111 and the positioning groove 22.

Preferably, the outer edge of the side of the first insulating member 14 remote from the substrate 11 is provided with an annular flange 142, and the inner diameter of the annular flange 142 is larger than the diameter of the anode current collecting plate 13 and the diameter of the winding core 3. The annular flange 142 can radially limit the winding core 3, and the winding core 3 is prevented from contacting the inner wall of the shell 2.

Preferably, the closed end of the housing 2 is provided with an explosion-proof valve 23 and the surface of the first insulating member 14 is provided with a pressure release hole 143. Through the setting of explosion-proof valve 23, can be when the cylinder battery takes place thermal runaway, timely burst explosion-proof valve 23 carries out the pressure release, and pressure release hole 143 can provide the passageway of thermal runaway energy transmission.

It should be noted that the positive electrode cap assembly 4 disclosed in this embodiment may be of a conventional structure.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (9)

1. The utility model provides a negative pole current collecting plate subassembly, its includes negative pole post (12), negative pole current collecting plate (13) and first insulating part (14), its characterized in that: the negative pole post (12) is fixedly arranged on a first insulating piece (14), one end of the negative pole post (12) is connected with a negative pole current collecting disc (13) arranged below the first insulating piece (14), the other end of the negative pole post is used for being connected with the negative pole end of the battery shell (2), a plurality of through holes (141) are formed in the surface of the first insulating piece (14) at equal intervals around the central axis of the negative pole post (12), the through holes (141) are formed in the periphery side of the negative pole post (12), and the through holes (141) are used for welding the negative pole current collecting disc (13) with the negative pole end of the winding core (3).

2. The anode current collecting disk assembly according to claim 1, wherein: the plurality of through holes (141) are arranged in a strip shape around the radial direction of the negative electrode column (12).

3. The anode current collecting disk assembly according to claim 2, wherein: one surface of the negative electrode current collecting disc (13) facing the first insulating piece (14) is provided with a welding groove (131) corresponding to the position of the through hole (141).

4. A cylindrical battery, comprising a casing (2), a winding core (3), a positive electrode cover plate assembly (4) and a negative electrode current collecting disc assembly (1) according to any one of claims 1 to 3, characterized in that: the casing (2) has the open end and the blind end that set up relatively, the blind end is equipped with mounting hole (21), the diameter of mounting hole (21) is less than the inner wall diameter of casing (2), roll up core (3) and negative pole current collecting plate subassembly (1) and set up in casing (2), roll up the negative pole end of core (3) and weld with negative pole current collecting plate (13), negative pole post (12) pass mounting hole (21) and are connected with casing (2), positive pole apron subassembly (4) are fixed to be set up in open end to with roll up core (3) positive pole end electricity and be connected.

5. The cylindrical battery according to claim 4, wherein: the negative electrode current collecting disc assembly (1) further comprises a substrate (11), the substrate (11) is arranged on one surface, far away from the negative electrode current collecting disc (13), of the first insulating piece (14), the negative electrode column (12) is fixedly arranged on the substrate (11) and is electrically isolated from the substrate (11), the negative electrode column (12) penetrates through the first insulating piece (14) and is connected with the negative electrode current collecting disc (13), the diameter of the substrate (11) is smaller than that of the first insulating piece (14), the substrate (11) is used for being connected with a mounting hole on the negative electrode end of a battery shell, and a plurality of through holes (141) are formed in the periphery side of the substrate (11).

6. The cylindrical battery according to claim 5, wherein: the negative electrode current collecting disc assembly (1) further comprises a second insulating part (15), a sealing part (16) and a riveting part (17), wherein the negative electrode column (12), the second insulating part (15), the substrate (11) and the first insulating part (14) are fixedly connected through the riveting part (17) in sequence, the sealing part (16) is arranged between the riveting part (17) and the substrate (11), and the riveting part (17) is connected with the negative electrode current collecting disc (13).

7. The cylindrical battery according to claim 5 or 6, wherein: the substrate (11) is provided with location portion (111) with the one end periphery side that first insulating part (14) are connected, the blind end inner wall of casing (2) is provided with and installs co-axial constant head tank (22) of hole (21), location portion (111) are used for being connected with constant head tank (22).

8. The cylindrical battery according to claim 5, wherein: the outer edge of one side of the first insulating piece (14) far away from the base plate (11) is provided with an annular flange (142), and the inner diameter of the annular flange (142) is larger than the diameter of the negative electrode current collecting disc (13) and the diameter of the winding core (3).

9. The cylindrical battery according to claim 4, wherein: the closed end of the shell (2) is provided with an explosion-proof valve (23), and the surface of the first insulating part (14) is provided with a pressure relief hole (143).